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Benjamin B A Raymond, Ranya Madhkoor, Ina Schleicher, Cord C Uphoff, Lynne Turnbull, Cynthia B Whitchurch, Manfred Rohde, Matthew P Padula, Steven P Djordjevic
Mycoplasma hyopneumoniae , an agriculturally important porcine pathogen, disrupts the mucociliary escalator causing ciliostasis, loss of cilial function, and epithelial cell death within the porcine lung. Losses to swine production due to growth rate retardation and reduced feed conversion efficiency are severe, and antibiotics are used heavily to control mycoplasmal pneumonia. Notably, little is known about the repertoire of host receptors that M. hyopneumoniae targets to facilitate colonization. Here we show, for the first time, that actin exists extracellularly on porcine epithelial monolayers (PK-15) using surface biotinylation and 3D-Structured Illumination Microscopy (3D-SIM), and that M...
2018: Frontiers in Cellular and Infection Microbiology
Marike Rüder, Benedikt M Nagel, Sven Bogdan
The most abundant immune cells in Drosophila are macrophage-like plasmatocytes that fulfill central roles in morphogenesis, immune and tissue damage response. The various genetic tools available in Drosophila together with high-resolution and live-imaging microscopy techniques make Drosophila macrophages an excellent model system that combines many advantages of cultured cells with in vivo genetics. Here, we describe the isolation and staining of macrophages from larvae for ex vivo structured illumination microscopy (SIM), the preparation of white prepupae for in vivo 2D random cell migration analysis, and the preparation of pupae (18 h after puparium formation, APF) for in vivo 3D directed cell migration analysis upon wounding using spinning disk microscopy...
2018: Methods in Molecular Biology
Xin-Xin Jin, Xiao-Xiang Chen, Jing Xiang, Yun-Zhou Chen, Li-Hui Jia, Bing-Wu Wang, Shun-Cheung Cheng, Xin Zhou, Chi-Fai Leung, Song Gao
A series of homoleptic mononuclear 8-coordinate FeII and CoII compounds, [FeII (L2 )2 ](ClO4 )2 (2), [FeII (L3 )2 ](ClO4 )2 (3), [FeII (L4 )2 ](ClO4 )2 (4), [CoII (L1 )2 ](ClO4 )2 (5), [CoII (L2 )2 ](ClO4 )2 (6), [CoII (L3 )2 ](ClO4 )2 (7), and [CoII (L4 )2 ](ClO4 )2 (8) (L1 and L2 are 2,9-dialkylcarboxylate-1,10-phenanthroline ligands; L3 and L4 are 6,6'-dialkylcarboxylate-2,2'-bipyridine ligands), have been obtained, and their crystal structures have been determined by X-ray crystallography. The metal center in all of these compounds has an oversaturated coordination number of 8, which is completed by two neutral homoleptic tetradentate ligands and is unconventional in 3d-metal compounds...
March 9, 2018: Inorganic Chemistry
Kazuaki Sawada, Ryosuke Kawakami, Ryuichi Shigemoto, Tomomi Nemoto
Three-dimensional (3D) super-resolution microscopy technique structured illumination microscopy (SIM) imaging of dendritic spines along the dendrite has not been previously performed in fixed tissues, mainly due to deterioration of the stripe pattern of the excitation laser induced by light scattering and optical aberrations. To address this issue and solve these optical problems, we applied a novel clearing reagent, LUCID, to fixed brains. In SIM imaging, the penetration depth and the spatial resolution were improved in LUCID-treated slices, and 160-nm spatial resolution was obtained in a large portion of the imaging volume on a single apical dendrite...
March 7, 2018: European Journal of Neuroscience
Anja Henss, Svenja-K Otto, Kaija Schaepe, Linda Pauksch, Katrin S Lips, Marcus Rohnke
Within this study, the authors use human mesenchymal stem cells incubated with silver nanoparticles (AgNPs) as a model system to systematically investigate the advantages and drawbacks of the fast imaging delayed extraction mode for two-dimensional and three-dimensional (3D) analyses at the cellular level. The authors compare the delayed extraction mode with commonly employed measurement modes in terms of mass and lateral resolution, intensity, and dose density. Using the delayed extraction mode for single cell analysis, a high mass resolution up to 4000 at m/z = 184...
February 28, 2018: Biointerphases
Qinglin Deng, Mengjiao Li, Junyong Wang, Kai Jiang, Zhigao Hu, Junhao Chu
Orthorhombic Nb$_2$O$_5$ (T-Nb$_2$O$_5$) has structural merit but poor electrical conductivity, limiting their applications in energy storage. Although graphene is frequently adopted to effectively improve its electrochemical properties, the ordinary modified methods cannot meet the growing demands for high-performance. Here, we demonstrate that different graphene modified routes play a vital role in affecting the electrochemical performances of T-Nb$_2$O$_5$. By only manual shaking within one minute, Nb$_2$O$_5$ nano-particles can be rapidly adsorbed onto graphene, then the free-anchored T-Nb$_2$O$_5$@graphene three-dimensional networks (NG-3D) can be successfully prepared based on hydrogel method...
February 19, 2018: Nanotechnology
Keunhee Kim, Hee-Seung Choi, Nan-Sim Pang
This report presents two cases of tooth autotransplantation using cone-beam computed tomography (CBCT), the three-dimensional (3D) simulation dental planning software and a computer-aided rapid prototyping (CARP) model. Two hopeless teeth of adult patients were replaced as their third molar teeth. Before deciding the autotransplantation, diagnostic CBCT images were acquired and imported to SimPlant software. The SimPlant dental program was used for surgical simulation prior to autotransplantation, which created 3D images of the available donor teeth and recipient site tooth and superimposed the images to display their morphological similarity...
February 16, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
Thibault Lagache, Alexandre Grassart, Stéphane Dallongeville, Orestis Faklaris, Nathalie Sauvonnet, Alexandre Dufour, Lydia Danglot, Jean-Christophe Olivo-Marin
Elucidating protein functions and molecular organisation requires to localise precisely single or aggregated molecules and analyse their spatial distributions. We develop a statistical method SODA (Statistical Object Distance Analysis) that uses either micro- or nanoscopy to significantly improve on standard co-localisation techniques. Our method considers cellular geometry and densities of molecules to provide statistical maps of isolated and associated (coupled) molecules. We use SODA with three-colour structured-illumination microscopy (SIM) images of hippocampal neurons, and statistically characterise spatial organisation of thousands of synapses...
February 15, 2018: Nature Communications
Young Chul Sim, Seung-Hyuk Lim, Yang-Seok Yoo, Min-Ho Jang, Sunghan Choi, Hwan-Seop Yeo, Kie Young Woo, Sangwon Lee, Hyun Gyu Song, Yong-Hoon Cho
Warm and natural white light (i.e., with a correlated colour temperature <5000 K) with good colour rendition (i.e., a colour rendering index >75) is in demand as an indoor lighting source of comfortable interior lighting and mood lighting. However, for warm white light, phosphor-converted white light-emitting diodes (WLEDs) require a red phosphor instead of a commercial yellow phosphor (YAG:Ce3+), and suffer from limitations such as unavoidable energy conversion losses, degraded phosphors and high manufacturing costs...
February 2, 2018: Nanoscale
Ming-Liang Tong, Min Feng
Single-ion magnets (SIMs) exhibiting slow magnetization relaxation in the absent of the magnetic field originates from their single spin-carrier centre. In pursuit of the high performance magnetic properties, such as high spin-reversal barrier and high blocking temperature, various metal centres were investigated to establish SIMs, including 3d and 5d transition metal ions, 4f lanthanide ions, and 5f actinide ions, which possess their unique zero-field splitting and magnetic properties. Therefore, proper ligand field is of great importance to different types of metals...
January 31, 2018: Chemistry: a European Journal
Firoj Ali, Sunil Aute, Sreejesh Sreedharan, H A Anila, Hiwa K Saeed, Carl G Smythe, Jim A Thomas, Amitava Das
BODIPY derivative, SF-1, exclusively shows a fluorescence ON response to HOCl and images endogenously generated HOCl in RAW 264.7 macrophages. Widefield and super resolution structured illumination microscopy images confirm localization in the Golgi complex and lysosomes, and hence specifically detects HOCl generated in these organelles. SF-1 is compatible with 3D-SIM imaging of individual cells.
January 31, 2018: Chemical Communications: Chem Comm
J-H Kwon, H-T Kim, S J Sim, Y J Cha, J Lee
The objective of this study is to develop an accurate, rapid, simple, and label-free assay technology that enables point-of-care diagnosis of AIDS. For this, 3-dimensional (3D) probes to sensitively detect anti-HIV antibodies were designed and synthesized by genetically presenting a HIV antigen (gp41) on the surface of engineered human ferritin nanoparticles. The 3D probes also present multi-copies of the hexa-histidine peptide (H6) on their surface to chemisorb gold ions (Au3+), which is essential for the generation and self-enhancement of assay signals...
January 24, 2018: Analyst
Jaroslaw Sedzicki, Therese Tschon, Shyan Huey Low, Kevin Willemart, Kenneth N Goldie, Jean-Jacques Letesson, Henning Stahlberg, Christoph Dehio
Entry of the facultative intracellular pathogen Brucella into host cells results in the formation of endosomal Brucella-containing vacuoles (eBCVs) that initially traffic along the endocytic pathway. eBCV acidification triggers the expression of a type IV secretion system that translocates bacterial effector proteins into host cells. This interferes with lysosomal fusion of eBCVs and supports their maturation to replicative Brucella-containing vacuoles (rBCVs). Bacteria replicate in rBCVs to large numbers, eventually occupying most of the cytoplasmic volume...
January 12, 2018: Journal of Cell Science
Hua Gong, Adam T Woolley, Gregory P Nordin
Our latest developments in miniaturizing 3D printed microfluidics [Gong et al., Lab Chip, 2016, 16, 2450; Gong et al., Lab Chip, 2017, 17, 2899] offer the opportunity to fabricate highly integrated chips that measure only a few mm on a side. For such small chips, an interconnection method is needed to provide the necessary world-to-chip reagent and pneumatic connections. In this paper, we introduce simple integrated microgaskets (SIMs) and controlled-compression integrated microgaskets (CCIMs) to connect a small device chip to a larger interface chip that implements world-to-chip connections...
January 22, 2018: Lab on a Chip
Lothar Veith, Julia Böttner, Antje Vennemann, Daniel Breitenstein, Carsten Engelhard, Jan Meijer, Irina Estrela-Lopis, Martin Wiemann, Birgit Hagenhoff
The increasing use of nanoparticles (NP) in commercial products requires elaborated techniques to detect NP in the tissue of exposed organisms. However, due to the low amount of material, the detection and exact localization of NP within tissue sections is demanding. In this respect, Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and Ion Beam Microscopy (IBM) are promising techniques, because they both offer sub-micron lateral resolutions along with high sensitivities. Here, we compare the performance of the non-material-consumptive IBM and material-consumptive ToF-SIMS for the detection of ZrO₂ NP (primary size 9-10 nm) in rat lung tissue...
January 15, 2018: Nanomaterials
Erkin Kuru, Carey Lambert, Jonathan Rittichier, Rob Till, Adrien Ducret, Adeline Derouaux, Joe Gray, Jacob Biboy, Waldemar Vollmer, Michael VanNieuwenhze, Yves V Brun, R Elizabeth Sockett
In the original version of this Article, a grant number and acknowledgement were omitted. The Acknowledgements section should have stated that one of the 3D SIM microscopes used for this research was supported by Medical Research Council UK grant (MR/K015753/1) to S. Foster, University of Sheffield, UK, and that the authors thank C. Walther and S. Foster for the access and their kind help with this. This has now been corrected in all versions of the Article.
January 8, 2018: Nature Microbiology
Zhiqiang Shen, Huilin Ye, Chi Zhou, Martin Kroeger, Ying Li
Graphene has been recognized as emerging 2D nanomaterial for many applications. Assembly of graphene sheets into 3D structures is an attractive way to enable their macroscopic applications and preserve the exceptional mechanical and physical properties of their constituents. In this study, we develop a coarse-grained (CG) model for 3D graphene foams (GFs) based on the CG model for a 2D graphene sheet by Ruiz et al.\ [Carbon 82:103--115, 2015]. We find that the sizes of graphene sheets play an important role in both structural and mechanical properties of 3D GFs...
January 9, 2018: Nanotechnology
Sebastiaan Van Nuffel, Nicolas Elie, Ethan Yang, Julius Nouet, David Touboul, Pierre Chaurand, Alain Brunelle
Imaging mass spectrometry (IMS) has become a powerful tool to characterise the spatial distribution of biomolecules in thin tissue sections. In the case of matrix-assisted laser desorption ionisation (MALDI) IMS, homogeneous matrix deposition is critical to produce high quality ion images and sublimation in particular has shown to be an excellent matrix deposition method for the imaging of lipids. Matrix deposition by sublimation is, however, a completely solvent-free system, which ought to prevent the mixing of matrix and analytes thought to be necessary for successful MALDI...
January 3, 2018: Analytical Chemistry
Dongli Xu, Weibin Zhou, Leilei Peng
Multiplexed imaging is a powerful tool for studying complex interactions inside biological systems. Spectral imaging methods that capture multiple fluorescent markers synchronously without sacrificing the imaging speed or resolution are most suitable for live imaging. We describe spectral-encoded structured illumination (spectral-SIM) light-sheet microscopy, which enables parallel multi-excitation-channel imaging in 3D. Spectral-SIM encodes the excitation wavelength as the phase of the illumination pattern, and allows synchronous image capture over multiple excitation channels at the same speed and spatial resolution as mono-channel structured light-sheet imaging...
December 11, 2017: Optics Express
D Melkonyan, C Fleischmann, A Veloso, A Franquet, J Bogdanowicz, R J H Morris, W Vandervorst
We introduce an innovative specimen preparation method employing the selectivity of a wet-chemical etching step to improve data quality and success rates in the atom probe analysis of contemporary semiconductor devices. Firstly, on the example of an SiGe fin embedded in SiO2 we demonstrate how the selective removal of SiO2 from the final APT specimen significantly improves accuracy and reliability of the reconstructed data. With the oxide removal, we eliminate the origin of shape artefacts, i.e. the formation of a non-hemispherical tip shape, that are typically observed in the reconstructed volume of complex systems...
March 2018: Ultramicroscopy
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